Effect of inclusions on initiation of stress corrosion cracks in X70 pipeline steel in an acidic soil environment

Liu, Z.Y.; Li, X.G.; Du, Cuiwei; Lü, Lin; Zhang, Y.R.; Cheng, Y. Frank

doi:10.1016/j.corsci.2009.01.007

Cited by 159 publications

(51 citation statements)

References 25 publications

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“…It is important to point out that in Figure 3d,d1 (−870 mV), it is possible to observe some inclusions that could have contributed to the cracking. Liu et al [22] concluded that the inclusions in the X70 steel are rich in brittle oxides that are incoherent with the matrix of the steel; thus, a great deformation of the crystalline lattice is formed. This deformation is the main factor for the preferential generation of microcracks between the borders of these inclusions and the steel.…”

Section: Surface Fracture After Ssrtmentioning

confidence: 99%

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

Galván-Martínez

Orozco-Cruz

Carmona-Hernandez

et al. 2019

Metals

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The effect of different cathodic potentials applied to the X70 pipeline steel immersed in acidified and aerated synthetic soil solution under stress using a slow strain rate test (SSRT) and electrochemical impedance spectroscopy (EIS) was studied. According to SSRT results and the fracture surface analysis by scanning electron microscopy (SEM), the steel susceptibility to stress corrosion cracking (SCC) increased as the cathodic polarization increased (Ecp). This behavior is attributed to the anodic dissolution at the tip of the crack and the increment of the cathodic reaction (hydrogen evolution) producing hydrogen embrittlement. Nevertheless, when the Ecp was subjected to the maximum cathodic potential applied (−970 mV), the susceptibility decreased; this behavior is attributed to the fact that the anodic dissolution was suppressed and the process of the SCC was dominated only by hydrogen embrittlement (HE). The EIS results showed that the cathodic process was influenced by the mass transport (hydrogen diffusion) due to the steel undergoing so many changes in the metallic surface as a result of the applied strain that it generated active sites at the surface.

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Section: Surface Fracture After Ssrtmentioning

confidence: 99%

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

Galván-Martínez

Orozco-Cruz

Carmona-Hernandez

et al. 2019

Metals

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“…Xue et al [26] and Jin et al [27] showed that HIC primarily nucleated at inclusions enriched in Si and Al oxides. However, Liu et al [28] studied the effect of different types of inclusions on HIC susceptibility and reported that HIC cracks do not nucleate around inclusions enriched with silicon. These types of inclusions have a spherical shape and are not sufficiently brittle to initiate cracks.…”

Section: Introductionmentioning

confidence: 98%

“…However, non-metallic inclusions are one of the dominant factors affecting hydrogen traps and hydrogen damage [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. If the number of nonmetallic inclusions (such as elongated manganese sulphide and clusters or stringers of oxide) is large, then their interface with the matrix may also contribute to hydrogen trapping, increasing the HIC susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructures and inclusions on hydrogen-induced cracking and blistering of A537 steel

Cao

Wang

et al. 2015

Materials Science and Engineering: A

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“…5. Though there are usually some other kinds of inclusions mixed with aluminum oxides, such as oxides of Si, Ca, and Mg, these inclusions are less sensitive to promote the initiation of HIC or stress corrosion cracking induced by HIC in a hydrogen revolution environment [14]. It also has been mentioned [15] that HIC germinates from the inclusion cluster of MnS or Al 2 O 3 .…”

Section: Hydrogen-induced Cracking Property In X80 Steelmentioning

confidence: 99%

Hydrogen induced cracking of X80 pipeline steel

Dong

Xiao

Liu

et al. 2010

Int J Miner Metall Mater

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The hydrogen-induced cracking (HIC) behavior of X80 pipeline steel was studied by means of electrochemical charging, hydrogen permeation tests, tension test, and scanning electron microscopy (SEM). The experimental results indicate that the increase of charging time and charging current density or the decrease of the solution pH value leads to an increase of the hydrogen content in X80 steel, which plays a key role in the initiation and propagation of HIC. It is found that the majority of macro-inclusions within the as-used X80 steel do not constitute a direct threat to HIC except aluminum oxides, which directly or indirectly lead to HIC. The hydrogen trap density at room temperature is estimated to be pretty high, and this is an essential reason why the steel is sensitive to HIC. After hydrogen charging, the elongation loss rate and area reduction of X80 steel decline obviously, taking a noticeable sign of hydrogen-induced plasticity damages. It is demonstrated that the losses of these plastic parameters have a linear relation to the fracture size due to hydrogen.

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Effect of inclusions on initiation of stress corrosion cracks in X70 pipeline steel in an acidic soil environment

Cited by 159 publications

References 25 publications

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

Effect of microstructures and inclusions on hydrogen-induced cracking and blistering of A537 steel

Hydrogen induced cracking of X80 pipeline steel

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